Cylinder ridge hone



July 11, 1967 A. voN TERscl-l CYLINDER RIDGE HONE Filed Sept 8, 1954 #f-gm,

United States Patent O 3,330,078 CYLINDER RIDGE HONE Alfred L. von Tersch, Maryville, Mo., assigner to Lisle Corporation, Clarinda, Iowa, a corporation of Iowa Filed Sept. 8, 1964, Ser. No. 394,996 2 Claims. (Cl. 51-352) This invention relates to a cylinder ridge hone having e'xpansibly adjustable supporting means adapted -to be rigidly supported in a cylinder of an internal combustion engine or the like below a ridge thereof, means being provided and carried by said supporting means for honing away such ridge upon rotation of the honing means.

One object of the invention is to provide supporting means of the general character shown in Brooks Patent No. 2,780,115 and honing means carried thereby for honing a cylinder ridge as distinguished from reaming the ridge as shown in the Brooks patent in order to eliminate such ridge when fitting oversize pistons and piston rings to a worn cylinder.

Another object is to provide a simple honing means in the form of 4a tool head rotatably supported by the sup porting means and having a plurality of hone supporting arms pivoted thereto and carrying on their outer end honing elements for honing coaction with the ridge of a cylinder, means being provided to bias the arms about their pivots in a direction for the honing elements to jesiiently engage the ridge during rotation of the tool A further object is to provide a novel form of hone supporting arm which may have either a honing element cemented thereto or one which is adjustable to present different portions thereof to the ridge as the honing element becomes worn.

Still a further object is to provide means for clamping the adjustable honing elements in the desired adjusted position.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my cylinder ridge hone, whereby the objects above contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and ilustrated in detail on the accompanying drawing, wherein:

FIG. 1 is -a plan view partly in section of a cylinder ridge hone embodying my present invention and showing 1t in operating position in a cylinder;

FIG. 2 is a vertical sectional View through a cylinder showing a partial side elevation of the honing tool with portions broken away and other portions shown in section;

FIG. 3 is a perspective view of one of the hone suppoting arms and the honing element cemented thereto, an

FIG. 4 is a perspec-tive view of a modified form of hone supporting arm and honing element.

On the accompanying drawing I have used the reference character S to indicate, in general, an eXpansibly adjustable supporting means such as one of the type shown in the Brooks patent above referred to. The supporting means S comprises upper and lower heads and 12 connected together by a screw-threaded adjusting sleeve 14 having a hexagon portion 16 for the application of a Wrench thereto for adjusting purposes. The adjustment determines the distance between the heads 10 and 12, which receive in slots thereof cylinder wall engaging blades 18 (preferably 3). One or both of the slots is inclined to the horizontal to effect radial adjustment of the blades as a resultant of relatively axial adjustment of the heads 10 and 12.

The blades 18 are biased toward the axis of the supporting means S by a garter spring 20 and the arrangement is thereby such that movement of the head 12 toward the head 10 will increase the effective diameter of the outer ends of the blades 18 for rigidly clampin-g the supporting means S in `a cylinder 56 by forceably contacting the bore 58 thereof below a ridge 60 of the cylinder. These ridges are formed because of wear of the cylinder ybore 58 to larger than its original diameter by the piston rings of the piston which reciprocates in the cylinder, the top surface of the upper piston ring defining the lower extent of the ridge 60. The ridge is thus left unworn and is a problem when fitting new oversize pistons and rings which usually must be inserted from the top of the cylinder. Even if inserted from the bottom, the upper surface of the top ring of the new piston would strike the ridge and result in breakage of the ring if it were not removed.

A hone carrying head 24 is rotatably supported by the supporting means S, the head having an upper flange 26, a lower ange 28 and a shank 30 extending both upwardly and downwardly therefrom. The lower end of the shank 30 is rotatable in a bore 22 of the sleeve 14 and during operation of the ange 28 rests on the top of the hexagon portion 16 of the sleeve. A hone carrying arm 32 is pivotally mounted with respect to the anges 26 and 28, a pivot 34 being provided for this purpose. The outer end of the arm 32 carries a honing element 36 which may be cemented or otherwise suitably affixed to the arm. In actual practice it is advantageous to provide a plurality of the arms 32 (such as three as illustrated in FIG. 1) of faster honing action and better centrifugal balance of the tool during operation.

'I'he .arms 32 are biased in the direction of the arrow 40 shown in FIG. l by springs 38 whereby the honing elements 36 resiliently contact the ridge 60 during rotation of the tool which is in the direction of the arrow 62 of FIG. 1. Such rotation is imparted to the tool by means of a flexible drive shaft 42 secured to the upper end of the shank 30 and having a shank 44 Iat its upper end adapted to |be received in the chuck of an electric drill or the like.

Due to the pivoted arrangement of the arms 32 they are automatically adjustable -to cylinders of different size as illustrated in FIG. 1, -a larger size ridge being shown at 60a and the arm and honing element when coacting therewith at 32B and 36a. Thus, a supporting means S adaptable for adjustment to different size cylinder bores is provided with a honing means automatically adjustable to accommodate ridges of the various size cylinders in lwhich the tool is used.

The lower end of the shank 30 is rem-ovable relative to the sleeve 14 to facilitate adjustment of the supporting means S in the cylinder bore 58. The supporting means is' inserted in the cylinder 56 while the honing mechanism is removed so that a socket wrench can be applied to the hexagon portion 16 of the adjusting sleeve 14 for rotating it. The supporting means, of course, is positioned at the proper elevation with respect to the ridge 60, and after being xed in position with respect to the bore the honing mechanism is mounted on the supporting means for operation, the ange 28 resting against the top of the sleeve 14 during rotation.

FIG. 4 shows a modified construction in which a hone supporting arm 46 to be used in place of each arm 32 has -a pair of hubs 48 to receive between them a cylindrical honing element 54. A clamping screw 50 passes rotatably through the upper hub 48 and is screw-threaded into -the lower hub 48, the arm being slotted as indicated at 52 to permit springing of the hubs toward each other for clamping the honing element 54 in any rotatably adjusted position. Thus diierent portions of the surface of the honing element may be presented to the ridge .5 as previously used portions become worn and replace- Y ment of the honing elements 54 therefore need not be -as Y arrangement of the parts of my cylinder ridge hone without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims such modied forms of structure or use Yof mechanical equivalents as may be reasonably includedwithin their scope.

I claim:

1. In a cylinder ridge hone, an expansibly adjustable supporting means adapted to be rigidly supported in a cylinder below a ridge thereof, said supporting means having avertical bore, means for honing away such ridge comprising a tool head rotatably supported by said l supporting means :and comprising a hub having upper and lower flanges, a hone supporting arm having the inner end said supporting -arm adapted to assume a non-radial position during operation, said tool head having a combined drive rod and shank passing through the hub and hav-ing la portion extending downward therefrom and rotatable in said bore, a honing element for such ridge carried by the outer end of said hone supporting arm, and means bias'- ing said arm to swing about its pivotal connection .to said head in a direction Yfor said honing element to engage and hone away said ridge upon rotation of said head.

2. A cylinder ridge hone according to claim 1 wherein said shank is removable relative to said supporting meansy to permit access thereto for adjusting the same.

References Cited UNTTED STATES PATENTS thereof located between ysaid anges and pivoted thereto, 20 DONALD R. SCHRAN, Primary Examiner. 

1. IN A CYLINDER RIDGE HONE, AN EXPANSIBLY ADJUSTABLE SUPPORTING MEANS ADAPTED TO BE RIGIDLY SUPPORTED IN A CYLINDER BELOW A RIDGE THEREOF, SAID SUPPORTING MEANS HAVING A VERTICAL BORE, MEANS FOR HONING AWAY SUCH RIDGE COMPRISING A TOOL HEAD ROTATABLY SUPPORTED BY SAID SUPPORTING MEANS AND COMPRISING A HUB HAVING UPPER AND LOWER FLANGES, A HONE SUPPORTING ARM HAVING THE INNER END THEREOF LOCATED BETWEEN SAID FLANGES AND PIVOTED THERETO, SAID SUPPORTING ARM ADAPTED TO ASSUME A NON-RADIAL POSITION DURING OPERATION, SAID TOOL HEAD HAVING A COMBINED DRIVE ROD AND SHANK PASSING THROUGH THE HUB AND HAVING A PORTION EXTENDING DOWNWARD THEREFROM AND ROTATABLE IN SAID BORE, A HONING ELEMENT FOR SUCH RIDGE CARRIED BY THE OUTER END OF SAID HONE SUPPORTING ARM, AND MEANS BIASING SAID ARM TO SWING ABOUT ITS PIVOTAL CONNECTION TO SAID HEAD IN A DIRECTION FOR SAID HONING ELEMENT TO ENGAGE AND HONE AWAY SAID RIDGE UPON ROTATION OF SAID HEAD. 